package netty.client;

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.Unpooled;
import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.SslContextBuilder;
import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
import lombok.extern.slf4j.Slf4j;

import java.nio.charset.StandardCharsets;
import java.util.concurrent.TimeUnit;

@Slf4j
public class DiscardClient {
    static final boolean SSL = System.getProperty("ssl") != null;
    static final String HOST = System.getProperty("host", "127.0.0.1");

    static final int PORT = Integer.parseInt(System.getProperty("port", "8009"));
    static final int SIZE = Integer.parseInt(System.getProperty("size", "256"));

    public static void main(String[] args) throws Exception {
        // Configure SSL.
        final SslContext sslCtx;
        if (SSL) {
            sslCtx = SslContextBuilder.forClient()
                    .trustManager(InsecureTrustManagerFactory.INSTANCE).build();
        } else {
            sslCtx = null;
        }

        EventLoopGroup group = new NioEventLoopGroup();
        try {
            Bootstrap b = new Bootstrap();
            b.group(group)
                    .channel(NioSocketChannel.class)
                    .handler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {
                            ChannelPipeline p = ch.pipeline();
                            p.addLast(new LoggingHandler(LogLevel.INFO));
                            if (sslCtx != null) {
                                p.addLast(sslCtx.newHandler(ch.alloc(), HOST, PORT));
                            }
                            p.addLast(new DiscardClientHandler());
                        }
                    });

            // Make the connection attempt.
            ChannelFuture f = b.connect(HOST, PORT).sync();
            Channel ch = f.channel();

            log.info("connect to {}:{}", HOST, PORT);

            for (int i = 0; i < 10; i++) {
                ch.eventLoop().schedule(() -> {
                    ch.writeAndFlush(Unpooled.wrappedBuffer(String.format("hello netty, %s", System.currentTimeMillis()).getBytes(StandardCharsets.UTF_8)));
                }, i, TimeUnit.SECONDS);
            }

            // Wait until the connection is closed.
            ch.closeFuture().sync();
        } finally {
            group.shutdownGracefully();
        }
    }
}
